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Home › Gemstones › Untreated Gemstones

Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
Untreated Gemstones Size
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

Size Explained

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For Example: 8-9
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Orange Untreated Gemstones
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Yellow Untreated Gemstones
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1.19ct Orange Hessonite Garnet, Square, VS

1.19ct Orange Hessonite Garnet, Square, VS

6 x 6 mm (calibrated)

$ 19.96

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0.78ct Green Peridot, Oval, VVS-VS

0.78ct Green Peridot, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 10.87

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8.72ct Brown Tiger'S Eye, Cushion, Opaque

8.72ct Brown Tiger'S Eye, Cushion, Opaque

14 x 12 mm (calibrated)

$ 8.68

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8.69ct Green Prehnite, Fancy, Translucent

8.69ct Green Prehnite, Fancy, Translucent

16.4 x 10.8 mm

$ 14.28

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1.62ct Yellow Tourmaline, Oval, VVS-VS
Tourmaline Product Video (747786)

1.62ct Yellow Tourmaline, Oval, VVS-VS

7.7 x 5.5 mm

$ 188.24

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5.71ctw Violet Amethyst, Oval, Transparent

5.71ctw Violet Amethyst, Oval, Transparent

12 x 8 mm (calibrated)

$ 31.28

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1.20ct Brown Rutile Topaz, Pear Shape, Transparent

1.20ct Brown Rutile Topaz, Pear Shape, Transparent

8.8 x 5.7 mm

$ 24.90

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10.35ct Multicolor Quartz With Marcasite, Pear Shape, Translucent

10.35ct Multicolor Quartz With Marcasite, Pear Shape, Translucent

21.1 x 11 mm

$ 56.71

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0.72ct Pink Morganite, Oval, VS

0.72ct Pink Morganite, Oval, VS

7.8 x 5.4 mm

$ 55.22

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0.78ct Gray Cat'S Eye Alexandrite, Oval, Opaque

0.78ct Gray Cat'S Eye Alexandrite, Oval, Opaque

5.7 x 3.9 mm

$ 161.85

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1.48ct Yellow Citrine, Round, VVS

1.48ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 11.79

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19.81ct Multicolor Amethyst Geode Slice, Fancy, Transparent

19.81ct Multicolor Amethyst Geode Slice, Fancy, Transparent

23.8 x 17 mm

$ 16.77

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1.34ct Orange Hessonite Garnet, Oval, VS

1.34ct Orange Hessonite Garnet, Oval, VS

7.3 x 6 mm

$ 20.48

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0.90ctw White Rainbow Moonstone, Oval, Transparent

0.90ctw White Rainbow Moonstone, Oval, Transparent

6 x 4 mm (calibrated)

$ 28.68

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0.28ct Yellow Sphalerite, Oval, VS-SI

0.28ct Yellow Sphalerite, Oval, VS-SI

3.9 x 3.3 mm

$ 13.94

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1.25ct Green Tourmaline, Emerald Cut, VS

1.25ct Green Tourmaline, Emerald Cut, VS

16.6 x 3.1 mm

$ 32.87

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4.73ct Yellow Citrine, Oval, VVS

4.73ct Yellow Citrine, Oval, VVS

12.7 x 8.4 mm

$ 28.27

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22.00ct Green Jade, Fancy, Translucent

22.00ct Green Jade, Fancy, Translucent

27.6 x 12.9 mm

$ 13.74

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1.28ct Yellow Beryl, Trillion, VVS-VS

1.28ct Yellow Beryl, Trillion, VVS-VS

8 x 8 mm (calibrated)

$ 30.59

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1.94ct Orange Hessonite Garnet, Oval, VS-SI

1.94ct Orange Hessonite Garnet, Oval, VS-SI

8.4 x 6.8 mm

$ 38.64

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2.80ct Violet Amethyst, Trillion, VS

2.80ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 19.52

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6.06ct Green Prehnite, Fancy, Transparent

6.06ct Green Prehnite, Fancy, Transparent

15.2 x 10.8 mm

$ 9.89

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1.40ct Yellow Citrine, Emerald Cut, VVS

1.40ct Yellow Citrine, Emerald Cut, VVS

8 x 6 mm (calibrated)

$ 11.16

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1.30ct Yellow Citrine, Round, VVS

1.30ct Yellow Citrine, Round, VVS

7 mm (calibrated)

$ 9.06

View Gem
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Why Buy Untreated Gemstones from GemSelect?

Natural Untreated Gemstones

Our untreated gemstones are completely natural and have not undergone any enhancement processes. These gems display their original color and clarity as formed in nature, making them highly valued by collectors, jewelers, and gemstone enthusiasts.

Buy Untreated Gemstones Online

At GemSelect you can easily shop untreated gemstones online with confidence. Our inventory includes carefully sourced loose gemstones from around the world, with full transparency regarding treatments and gem origins.

Natural Untreated Loose Gemstones

Why Choose Untreated Gems?

Untreated gems are prized because they remain exactly as nature created them. Without heat or chemical treatments, these stones offer rarity and authenticity that many collectors and jewelry designers prefer.

Unheated Sapphire and Ruby

Some of the most sought-after untreated gemstones include unheated sapphire and ruby. These rare stones retain their natural color and are highly valued due to the absence of heat treatment commonly used to enhance corundum.

Gemstone Authenticity and Transparency

Every gemstone at GemSelect comes with clear treatment disclosure. When purchasing untreated stones, buyers can be confident they are receiving authentic gems that have not been altered by heat or other enhancement methods.

Untreated Gems for Custom Jewelry

Natural untreated gemstones are perfect for custom jewelry pieces. Their unique appearance ensures every ring, pendant, or pair of earrings features a one-of-a-kind gemstone created by nature.

Rare and Collectible Gemstones

Because many gemstones are routinely treated, truly untreated examples can be relatively rare. Collectors often seek untreated stones because they represent the most natural state of a gemstone.

Learn more about gemstone treatments and natural gem formation on our Gemstone Treatment Guide.

FAQs

What are untreated gemstones?

Untreated gemstones are natural gems that have not been enhanced with heat, chemicals, irradiation, or other treatments. They retain their original appearance as formed in nature.

Are untreated gemstones more valuable?

In many cases untreated gemstones are more valuable because they are rarer than treated stones. Natural color without enhancement is highly prized by collectors and investors.

How can I tell if a gemstone is untreated?

Gemstone treatment is typically determined through gemological testing. Reputable sellers like GemSelect clearly disclose whether a stone is untreated or has received any enhancements.

Which gemstones are commonly untreated?

Some gemstones frequently found untreated include garnet, spinel, peridot, and certain sapphires. However, many gem types may be treated depending on their origin and quality.

Are untreated gemstones suitable for jewelry?

Yes, untreated gemstones can be excellent for jewelry depending on their hardness and durability. Popular choices include sapphire, ruby, spinel, and garnet.

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate
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